Cross-slide construction for machine tools



' Oct. 26, 1943. J. E. MAKANT 2,332,805

. CROSS SLIDE CONSTRUCTION FOR MACHINE TOOLS Filed Dec? 19, 1941 I5 Sheets-Sheet l JEarfe Mafia 71f Oct. 26, 1943. J. E. MAKANT GROSS SLIDE CONSTRUCTION FOR MACHINE TOOLS Filed Dec. 19. 1941 5 Sheets-Sheet 2 Oct. 26, 1943'. J. E. MAKANT CROSS SLIDE CONSTRUCTION FOR MACHINE TOOLS Filed Dec. 19, 1941 3 Sheets-Sheet 3 \I. Ear/e Mafia/77 i,

Patented Oct. 26, 1 943 UNITED STATES PATENT" porn-ct, r f 2,332,805 q Q onoss suns CONSTRUCTIQN LFOR y, TOOLS e H Joseph Earle Makant, Pawtucket, R. l.*,"assignor to Potter & Johnston Machine Company, Pawtucket, R. I., a corporation of Rhode Island Application December 19, 1941, Serial No. 423,687

Claims, (01. szs-zsi The present invention relates to improvements in machine tools of the automatic chucking type and resides more particularly in a cross-slide construction and operation thereof. i

In machine tools of the above mentioned type comprising four principal e1ementsi. e., head stock, cross-slide, turret-slide and basethe cross-slide has consisted of a single element or a one piece slide having tool holders mounted on its end portions and arranged on opposite sidesvof the chuck so that upon reciprocation of the cross-slide the tools on its opposite ends will be brought alternately into engagement with the Work-piece in the chuck to operate upon opposite sides of the piece, the slide being actuated by cam drum to effect said operation of the slide as well as to placeit at proper times in neutral positions with their tools out of contact with the work-piece, these operations being re lated to the movement of the turret-slide or independently thereof. Therefore, it has been impossible with the standard construction of closs-slide for automatic chucking lathes to bring the toolsof a crosssli'de on opposite sidesof the chuck into work performing position simultaneously.

The object of the present invention is the provision of a very simple and relatively inexpensive cross-slide means mounted on'the usual cross-slide base of automatic chucking lathes that can be operated from a single driving source connected with one end of thecross-slide which,

when moved, will cause, through intermediate means, the other end of the cross slide to move in an opposite direction. n

The invention further residesin the sundry details of construction, combination and arrangement of parts andthe operation thereof as more fully described hereinafter and pointed out in the appended, claims. n In the drawings, which show the preferred embodiment of the inventionras at present devised, 1"

Figure 1 is a plan view ofa-twin spindle automatic chucking turret lathe equipped with the improved cross-slide construction;

Figure 2 is a vertical sectional View of the improved cross-slide construction and taken substantially on line 22 of Figure l; r

Figure 3 is a top planview of the improved cross-slide construction with the tool holders notshown and with the top cover plate removed to show detailed construction; Figure 4 is atransverse sectional view of the ating its various instrumentalities.

cross-slide construction taken substantially on line 4-4 of Figure 3; h

Figure 5 is an end view of Figure 3; and

Figure 6 is a fragmentary side elevation of a cross-slide construction at an intermediate portion thereof looking substantially in the direction of the arrow a in Figure 4. h

In referring to the drawings in detail," like characters of reference throughout the specification and drawings will denote similar and like parts. I

As an" aid to a better understanding of the invention'presently to be described in detail, it should be stated that the invention is shown in the drawings applied to a twin spindle, single turret automatic chucking lathe as one example of its application, but the invention may be applied to other types of chucking Lathes such, for instance, as a single spindle or multiple spindle lathe. Also, the machine tool, illustrated in Figure 1 of the drawingsycomprises a head stock A inwhich is mounted a pair of horizontally spaced work spindles B and B which carry, re-- spectively, chucks C and C; a base D which supportsia turret-slide E and cross-slide F in the conventional manner, i. e., in cooperative relation with respect to Work supported inthe chucks C and C. Abase pan G may underlie the headstock A and the base Das is usually the case and may or may not be integral therewith;

Reference may be had to United States Pat-- ent 1,381,928 as illustrative of the manner of coordinating the function of the various parts of the machine and as disclosing means of actu- In the case of a twin spindle lathe machine, as shownf the spindles will be driven synchronously from a source of power, indicated at P, there being a drive connection between at least one of the spindles and the feed shaft H by which the rate of feed movement of the tools-either carried bythe turret "E or the cross-slide F-is controlled by the spindle speed, provision preferably being made by which idle movements of the tools toward and from the work are produced at a constant higher speed. Both the turret-slide E and the cross-slide F are recipro cat'ed by cam drums, or other means, which are geared to and receive motion from the feed shaft H. Also, of course, the spindle and feed shaft may be revolved at different speeds which are automatically selected.

' With the above brief description of the type of machine Withwhich the present invention is has to be moved closely together.

rear sides of the chucks C and C and upon each end of the slide is mounted a'tool-hol'der J. The tools T in the holders are brought alternately into engagement with the work held inthe chuck or chucks (as the case may be) by means of a cam drum I mounted on the rear side of the base D upon each reciprocal movement of the slide from its neutral or inoperative position.

With particular reference'to Figures 2 and 3 of the drawings, the present invention proposes to out or remove a center section of the conventional cross-slide F so as to provide two aligned cross-slide members It) and II slideably mounted on the slide-way s as before, and both actuated from the single cam drum I, preferably positioned at the rear side of the machine, as particularly shown in the aforesaid mentioned patent as well as in Figures 1 and 2 hereof.

Positioned on the cross-slide base S Within the slide-way s thereof and betwen the inner ends of the slide members it and II is disposed a .bearing block i2, which is secured to the station ary base 8- by means of screw bolts or other suitable fasteners is, Fig. 4. The center portion of the upper face of the bearing block [2 is provided With a recess l4, preferably circular, to receive a pinion gear loosely mounted on the shank of a headed-stud Hi, the free end of which is received in a cylindrical bore l1 forming a reduced concentric lower extension of the recess id. The head iiia of the stud i6 lies within the recess it above the pinion 5 and its bushing H3 and is dimensioned to close said recess.

Each slide member H] and II has a rack bar as and iii, respectively, projecting from its inner or opposed end and arranged to lie on opposite sides or" the pinion l5 and meshing with the pinion. These racks 29 and 28 have their inner ends threadedly attached to their respective slide members; and each slide member has an elongated bore 22 therein axially aligned with-the rack-bar on the other slide member so as to receive and accommodate the length of said racks, thus allowing the inner ends of said slide mem- The rack-bars 2B and 2| pass through openings 28a and Zia, in the block I2, these openings serving as guide means for the barsand for maintaining them in proper contact and position with respect to the pinion iii. A cam roller stud is mounted in one of the slide members-the slide member H in' the drawingsand carries a cam roller 2t which extends into a cam path 215 on the cam ,drum I. The cam drum ismounted in the housing 26 on a shaft 21 and'is driven from the feed shaft I-I through the medium of the worm 29 on the feed shaft and the worm gear as with which the cam drum is removably connected. Thus, it will be seen that from a common source of power, namely the camdrum I, the two cross-slide members 10 and l [are moved in opposite directions toward and from each other with relation to the work held in the chucks of the spindles B and B, enabling both tool carrying ends of the cross-slide means to be brought into operation simultaneously or to be removed to a neutral position as may be required.

The tool holders J are adjustable on the slides 10 and H by means of headed bolts 32 whose headed ends are disposed in T-slots 33 in said slide members. Thus the tools may be adjusted for Work of different sizes or positioned so as to be ineffective if only one tool is desired for any effective cutting operation, particularly where the invention is applied to a single spindle malying against the smooth sides of the slide memhere it and H. A cover plate 39 extends between the top edges of the side plates and the adjacent ends of the slide member Ill and H and is held in position by screws Ml. Packing material may also be disposed around the perimetral surface of the inner ends of the slide members it and H, as shown at 42, and may be held in place byplates t2 and 43 applied to the faces of the inner ends of the slide members and held in position by any suitable means, such as screws M.

From the above it will be seen that the present invention provides a very simple mechanism whereby the cross-slide means of automatic lathes may be provided with two slide sections mounted in alignment in the ways of the same and usual slide baseand be moved simultaneously in opposite directions from one common source of power.

Having thus described the invention and the manner in which it may be performed it is understood that it is not to be limited to the exact details shown and described as it is subject to a various modifications without departing from the spirit of the invention and that the invention is only to be limited by the terms of the claims herein appended.

What is claimed is:

1. In a turret lathe, a base, a tool-carrying cross-slide means, power'means for reciprocating said cross-slide means, said cross-slide means including guideways mounted on said base in the same horizontal plane and 'two cross-slide members slideably mounted in said guideways,

' tively, engaging with opposite sides of the pinion, respectively; and means for enclosing the pinion and the inner ends of the cross-slide members and with which the latter have sliding relation. r

3. In a turret lathe, a base for the machine, a tool-carrying cross-slide means to act upon a work-piece in cooperative relation with tools on the turret, said tool-carrying means including a guideway mounted transversely on said base and two cross-slide member slideably mounted,respectively, in opposite end portions of said guideway, a power means for reciprocating said toolcarrying means and mounted at one side of the base near an end of the guideway, anoperative connection between one of said cross-slide members and said power means for moving said one cross-slide member in one direction in said guideway, and an operative connection between said first and second cross-slide members and within the confines of said guideway for moving said second cross-slide member from the first crossslide member in said guideway and in a direction opposite to thelatter.

4. In a lathe comprising a head stock and a cross-slide base having slide-ways therein for cross-slide mechanism and extending transversely of the head stock, the combination of a twopart cross-slide means disposed in the Ways of the cross-slide base in substantial alignment, each of said parts of the cross-slide means being adapted to carry tool holders on, the outer end portions thereof, power driven means for reciprocating one part of the cross-slide means in its slide-way, ablock disposed in the slide-way of the cross slide base between the inner ends of thecross-slide parts and having a recess in its top surfaceto accommodate a pinion gear, the

bottom of said recess further having a reduced bore therein, a stud disposed in said bore and projecting upwardly into said recess, a pinion disposed in said recess and mounted on the stud, rack bars projecting outwardly from the inner ends of said cross-slide parts andextending through guide openings in said block and meshing with said stud, respectively, on opposite sides thereof.

5. In a lathe comprising a head stock and a cross-slide base having slide-ways therein for cross-slide mechanism and extending transversely of the head stock, the combination of a twopart cross-slide means disposed in the ways of the cross-slide base in substantial alignment,

I each of said parts of the cross-slide means being adapted to carry tool holders on the outer end portions thereof, power driven means for reciprocatin'gr one part of the cross-slide means. in its slide-way, a block disposed in the slide-way of the cross-slide base between the inner ends of the cross-slide parts and having a recess in its top surface to accommodate a pinion gear, the

bottom of said recess further having a reduced bore therein, a stud disposed in said bore and projecting upwardly into said recess, a pinion disposed in said recess and mounted on the stud, rack bars projecting outwardly from the inner ends of said cross-slide parts and extending through guide openings, in said block and mesh ing with said stud, respectively, on opposite sides thereof, and means provided in each cross-slide part to slidably accommodate the forward end of the rack bar of the other part.

JOSEPH EARLE MAKANT. 

